More Nonlinear filter feedback

[Paul Perry]

At 11:17 AM 23/07/98 -0700, Sean Costello  wrote:

>  Can you
>describe the effect of the diodes in the feedback opamp of the MS-20
>filter, from an aesthetic perspective? 
....there is quite a bit of harmonic generation here...
when the 2 sections are set oscillating you can get a didgeriou effect
(first filter around 100Hz, sweep second around at a higher freq)
When oscillating, the filters will lock together if too close in freq.

 Or from an electronic
>perspective?
......???????.... but, a compression type ckt in a positive feedback
loop I suppose still acts as a compressor...

 Also, is there any differential amp distortion in the
>MS-20 from the inputs of the LM13600's, or are the signal levels too
>low?
....they are low, but I havn't compared with LM13700 which are very hard
to get in Australia
>
paul perry melbourne australia